KR20050096830A - Elevator control device - Google Patents

Abstract

It aims at obtaining the elevator control apparatus by which a plurality of hoist drives exactly synchronously, and acquires stable running property.

A position control unit for generating a speed instruction of the hoist 1A, 1B based on a deviation input between the common position command and the output feedback signal of the position detectors 2A, 2B of the hoist 1A, 1B. 16A, 16B and the winding command 1A, based on a deviation input between the speed command generated by the position control units 16A, 16B and the output differential feedback signal of the position detectors 2A, 2B of the hoist 1A, 1B. Speed control units 17A and 17B for generating current command of 1B and current control units 5A and 5B for outputting current to hoist 1A and 1B based on the current commands generated by these speed control units 17A and 17B. ).

Description

Elevator control device {ELEVATOR CONTROL DEVICE}

The present invention relates to an elevator control apparatus for lifting and lowering the elevator by driving a rope connecting the cargo car and the balance weight with a plurality of hoisting machines.

In the conventional high speed and high capacity elevator control apparatus, a car is driven by one hoist, so that a large space is required in order to manufacture and install a high capacity hoist. In contrast, for example, as in Patent Document 1, there is a method of driving a car using a plurality of hoisting machines.

That is, in patent document 1, a main winding machine and a sub winding machine are provided, and when a large driving force is required by monitoring a driving state of an elevator by a control apparatus, a sub winding machine is driven to assist a main winding machine.

The sub-winder is provided with an interlocker which controls the driving force transmitted from the electric motor to the deflector sheave in slip operation, and controls the adjustment of the speed, torque and the like with the main winding machine.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-145544 (Page 4, Fig. 3)

Since the conventional elevator control apparatus is comprised as mentioned above, since the adjustment of the speed, torque, etc. between the hoisting machines is performed by the mechanical interlock which performs slip operation | movement, a response characteristic is inferior, operation | movement becomes unstable, and maintenance surface also becomes disadvantageous. In addition, although the main winding machine, the position error and the speed error between each winding machine may occur due to the difference in the extension of the rope due to the unbalance of tension along the moving rope in the main rope and the compensation rope during the plurality of auxiliary winding periods. The system has a problem that it is difficult to drive the car stably.

This invention is made | formed in order to solve the above problems, It aims at obtaining the elevator control apparatus which can drive a plurality of hoisting machines exactly synchronously, and can obtain stable running property.

Moreover, it aims at obtaining the elevator control apparatus which can hold | maintain the fixed attitude | position of the car at the time of the lifting.

An elevator control apparatus according to the present invention is an elevator control apparatus for lifting and lowering a car by driving a rope connecting a cargo car and a balance weight with a plurality of hoisting machines, wherein the output position of the hoisting machine is detected for each hoisting machine. And a current supply means for supplying a current to the hoist based on the position input common to the position detector and the deviation input between the position command common to the plurality of hoists and the output feedback signal of the position detector of the hoist.

(Example 1)

First, the structure of the elevator system which applies the elevator control apparatus of this application is demonstrated by FIG. 1 is a system in which a plurality of traction machines are provided for each of two ropes and drive each rope. That is, the car 6 and the balance weight 7 which accommodate the user which is a cargo in FIG. 1 are connected by two ropes 3A and 3B. The rope 3A is driven by a hoist 1A attached to a base 18 provided integrally with the building. Specifically, the rope 3A is wound around a drive sheave integrally connected with the rotor of the electric motor constituting the hoisting machine 1A, and the rope 3A is driven and driven by the rotation of the motor. 6) is lifted and operated. Similarly, the rope 3B is driven to run by the hoist 1B.

The overhead sheaves 8A and 8B are drive sheaves attached to the base 18 so that the shafts are in a horizontal position, and are driven to rotate the running of the ropes 3A and 3B. The car 6 and the weight 7 Define the hanging position. The deflector sheaves 9A and 9B are drive sheaves attached to the base 18 so that the shafts are parallel to the axes of the hoisting machines 1A and 1B and are driven to rotate in the running of the ropes 3A and 3B. ) And the required contact angles with the ropes 3A and 3B. Although the balance apparatus 13A and the balance apparatus 13B are mentioned later about the use, the weight apparatus 13A and 13B detect the weight which each rope 3A and the rod 3B bear.

Fig. 2 shows another winding method, which is different from Fig. 1 in that two ropes 3A and 3B are common, and this common portion is driven by the hoisting machine 1A and the hoisting machine 1B. . Of course, also in this system, in order to realize a smooth driving characteristic, accurate synchronous operation of both winding machines 1A and 1B is required, and the control apparatus which is an essential part of this invention shown below becomes effective.

In addition, unless otherwise indicated previously, the control apparatus enumerated below is applicable similarly to the elevator system of both types of FIG.

Fig. 3 is a circuit diagram showing the elevator control device in accordance with the first embodiment of the present invention. In the figure, the position detectors 2A and 2B output position detection values based on the rotation angles of the rotors of the hoisting machines 1A and 1B using so-called rotary encoders.

As shown in FIG. 3, one position command common in the control apparatus 4 branches into two systems, and inputs it into the position control part 16A and the position control part 16B. The position signals from the position detectors 2A and 2B attached to the hoisting machines 1A and 1B are fed back to the position control unit 16A and the position control unit 16B, respectively.

In addition, the position signals of the position detectors 2A and 2B are differentiated to be fed back to the speed control unit 17A and the speed control unit 17B as speed detection signals.

In addition, the current control units 5A and 5B feed back each current detected by the current sensor and configure the three-phase AC current from the PWM inverter unit based on the voltage command signal from the current control unit to configure the winding machines 1A and 1B. Supply to synchronous motor.

Next, the control operation will be described. The position control unit 16A and the position control unit 16B generate a speed command to the speed control units 17A and 17B so that the applied position command and the current position from the position detectors 2A and 2B coincide. The speed control unit 17A and the speed control unit 17B provide a current command to the current control units 5A and 5B so that the speed signal generated by differentiating the speed command generated by the position control units 16A and 16B matches the position detection signal. Create

Reaction force from the rope acts on the hoisting machine 1A and the hoisting machine 1B as a disturbance torque to the control system, respectively, via a sheave (driven sheave). Since the reaction force is caused by the force from the rope or the friction force in the sheave, the same reaction force does not necessarily act on the hoisting machine 1A and the hoisting machine 1B. As a result, it occurs that the position of the hoist 1A and the hoist 1B does not correspond. In order to reduce the error by this mismatch, the position signal of each hoisting machine 1A and the hoisting machine 1B is fed back.

As in the case of position, inconsistency also occurs at the speed of rotation, resulting in a problem that the car 6 vibrates as a result. In order to suppress this vibration generation, the respective speed signals obtained by differentiating the position detection signals from the hoist 1A and the hoist 1B are fed back.

The current control unit 5A and the current control unit 5B operate so that the current value detected by the current sensor matches the current command (equivalent to the torque command) from the speed control unit 17A and the speed control unit 17B. If there is a difference in electrical responsiveness between the hoist 1A and the hoist 1B, the hoist 1A and the hoist 1B do not generate torque at the same timing with respect to the current command. For this reason, the torque which synthesize | combined two fluctuates and the car 6 vibrates. To suppress this, each current detection signal is fed back so that the responsiveness is equal.

As described above, the position control is the final control target, but this alone is not necessarily enough to follow the change. Therefore, in the first embodiment, a control characteristic which is more accurately synchronized is obtained by feeding back a change in speed (a differential value of the position is significant) or an acceleration (a torque or current command is significant) in which a phenomenon occurs earlier than a change in position. It can be.

Depending on the required control performance and the conditions of the elevator drive device including the hoisting machine, the circuit configuration only by feeding back the position signals of the hoisting machine 1A and the hoisting machine 1B to the position control unit 16A and the position control unit 16B is also provided. Stable operation characteristics can be obtained without any problems.

Hereinafter, although various modified examples which intend to improve the control characteristic of the elevator control apparatus driven by a plurality of hoisting machines are shown, description will be made centering on the different part from Example 1 mentioned above.

(Example 2)

Fig. 4 is a circuit diagram showing the elevator control device in accordance with the second embodiment of the present invention.

The position signals from the position detectors 2A and 2B attached to the hoisting machines 1A and 1B are input to the position output transducer 10, and the output signals from the position output transducer 10 are respectively input to the position controller 16A, It is configured to feed back to the position control unit 16B. In the position output transducer 10, as shown in FIG. 5, for example, two position detection signals are arithmetic-averaged and fed back to each position control part 16A, 16B.

In the configuration of FIG. 3 of the first embodiment, when the difference between the position of the hoist 1A and the hoist 1B is extremely large, the speed command generated by each of the position controllers 16A, 16B also depends on the difference in position. Big difference occurs. As a result, the torque between the rope 3A and the rope 3B also becomes extremely large, and as a result, the car 6 is vibrated in the yawing mode. By feeding back a signal obtained by averaging the position signals from the two winding machines 1A and 1B, the above extreme phenomenon is alleviated and unnecessary vibration is suppressed.

In addition, the averaging process of a position signal is not limited to the case of carrying out the arithmetic mean ((A + B) / 2) of signals A and B shown in FIG. You can do it.

(Example 3)

Fig. 6 is a circuit diagram showing the elevator control device in accordance with the third embodiment of the present invention.

A signal obtained by differentiating the position signals from the position detectors 2A and 2B attached to the hoisting machines 1A and 1B is input to the position output differential value converter 11, and the output signal from this position output differential value converter 11 is obtained. Are fed back to the speed control unit 17A and the speed control unit 17B, respectively. In the position output differential value converter 11, as shown in FIG. 7, for example, two position detection differential signals are arithmeticly averaged and fed back to the respective speed control units 17A and 17B.

Also in this case, the car 6 has the effect of not yawing vibration. However, since the difference from Figs. 4 and 5 is averaged in the speed feedback loop, the responsiveness functions faster than the averaging action in the position feedback loop. Therefore, the vibration can be reduced more quickly.

Also in this case, as in the second embodiment, the averaging process of the position differential signals is not limited to the case where the arithmetic mean ((A '+ B') / 2) of the signals A 'and B' shown in FIG. Averaging You can do it.

(Example 4)

Fig. 8 is a circuit diagram showing the elevator control device in accordance with the fourth embodiment of the present invention.

As shown in FIG. 8, it is attached to the overhead sheave 8A and the overhead sheave 8B, and is attached to the signal output from the 2nd position detector which detects a position based on the rotation angle, and the hoist 1A, 1B. The difference with the signal output from the (first) position detectors 2A, 2B is calculated, and the difference signal is fed back to the position control units 16A, 16B.

Since the position detectors 2A and 2B perform position detection based on the rotation angles of the rotors themselves constituting the hoisting machines 1A and 1B, the detection response is high and is optimal as the feedback amount of control. However, during acceleration and deceleration of the hoisting machines 1A and 1B, in particular, when the acceleration and deceleration speeds are large, slippage occurs between the ropes 3A and 3B or elongation occurs in the ropes 3A and 3B, resulting in ropes 3A and 3B. ), There is a possibility that a deviation occurs between the position of the car 6.

On the other hand, since the overhead sheaves 8A and 8B rotate in accordance with the running of the ropes 3A and 3B, the second position detector which performs position detection based on the rotation angle has no influence of the acceleration / deceleration operation. small. Thus, the difference signal described above is compensated for by detecting the position detection errors of the position detectors 2A and 2B that may occur due to this acceleration / deceleration operation by the detection signals from the second position detector by the overhead sheaves 8A and 8B. Is fed back to the position control unit 16A, 16B.

Because of the configuration as described above, even if there is a difference in the amount of elongation in the ropes 3A and 3B and the amount of slip in the sheave, the misalignment can be corrected and driven in each of the hoisting machines 1A and 1B, thereby driving the car 6. Stability and no posture can be obtained.

In addition, as a 2nd position detector, instead of providing in the overhead sheaves 8A and 8B, it is the same condition as the overhead sheaves 8A and 8B by following the rotation of the ropes 3A and 3B. You may provide a position detector in the deflector sieve 9A, 9B of a characteristic.

(Example 5)

Similarly to the fourth embodiment, the fifth embodiment prevents a decrease in the position detection accuracy caused by the acceleration and deceleration operations of the hoisting machines 1A and 1B. Here, the 3rd position detector which performs a position detection is employ | adopted based on the rotation angle of the governor 12 shown in FIG. And as shown in FIG. 10, the signal output from the 3rd position detector provided in this governor 12, and the signal output from the (1st) position detector 2A, 2B attached to the hoist machines 1A, 1B. The difference between and is calculated, and the difference signal is fed back to the position control units 16A and 16B.

As shown in FIG. 9, the governor 12 is provided separately from the drive system and rotates in accordance with the running of the rope 3C connecting the car 6 and the weight 7. It is used to detect the lifting position of (6). Since the rope 3C is not subjected to the tension due to the driving force of the hoisting machines 1A and 1B, the third position detector outputted in accordance with the running of the rope 3C is the aforementioned overhead sheave 8A and deflector sheave ( Compared with the position detector based on the rotation angle of 9A) or the like, the influence of the acceleration and deceleration of the hoisting machines 1A and 1B is virtually eliminated, and the compensating performance of the position detection errors of the position detectors 2A and 2B due to the acceleration and deceleration operation are reduced. This improves.

(Example 6)

Fig. 11 is a circuit diagram showing the elevator control device in accordance with the sixth embodiment of the present invention. As shown in the figure, the signals output from the second position detectors provided on the overhead sheave 8A and the overhead sheave 8B are differentiated to form a speed detection signal and attached to the hoisting machine 1A and the hoisting machine 2B. The difference between the speed detection signal obtained by differentiating the signals output from the position detector 2A and the position detector 2B is calculated, and the difference is fed back to the speed control unit 17A and the speed control unit 17B.

Since the structure is configured as described above, the ropes 3A and 3B are caused to slip in the sheaves of the hoisting machines 1A and 1B by the acceleration and deceleration operation, and even if the vibration caused by the difference in the amount of slip occurs, the overhead sheave 8A, The speed of the car 6 can be fed back accurately by the speed detection signal which differentiated the signal from 8B), and the car 6 can be stably run.

In addition, as a 2nd position detector, instead of providing in the overhead sheaves 8A and 8B, it is the same condition as the overhead sheaves 8A and 8B in that it is driven following rotation of the ropes 3A and 3B, You may provide a position detector in the deflector sieve 9A, 9B of a characteristic.

In addition, as shown in FIG. 12, in place of the overhead sheaves 8A and 8B, a third position detector that performs position detection based on the rotation angle of the governor 12 is provided, and the output derivative is differentiated. The difference between the detection signal and the speed detection signal obtained by differentiating the signals output from the position detector 2A and the position detector 2B attached to the hoisting machine 1A and the hoisting machine 2B is calculated. It may also be a configuration for feeding back to the 17A and the speed control unit 17B. In this case, the compensating performance of the position detection error of the position detectors 2A and 2B due to the acceleration / deceleration operation is further improved for the same reason as described in the fifth embodiment, and as a result, the acceleration / deceleration operation The ropes 3A and 3B slip on the sheaves of the hoisting machines 1A and 1B, and even if a vibration caused by the difference in the amount of slip occurs, the car 6 is driven by a speed detection signal that differentiates the signal from the governor 12. Speed can be fed back accurately, and the car 6 can be driven more stably.

(Example 7)

Each of the above embodiments aims to obtain a stable running by driving a plurality of hoisting machines accurately and synchronously, and is applicable not only to the driving method of FIG. 1 but also to the driving method of FIG.

The elevator control apparatuses of the seventh embodiment and the following embodiments are further aimed at maintaining the posture of the car 6 more steadily and at the time of elevating, and are applied to the elevator system of the driving method of FIG. 1. It is possible.

It is a circuit block diagram which shows the elevator control apparatus in Example 7 of this invention. Here, 1/2 of the deviation of the output signal of the balance apparatus 13A, 13B attached to the car 6 is added and subtracted as the position command correction signal to the input terminal of the position control part 16A and the position control part 16B, respectively. have.

The weighing apparatus 13A and the weighing apparatus 13B detect the weight which the rope 3A and the rope 3B bear by detecting the tension applied to the rope 3A and the rope 3B, respectively. When the user of the elevator is located almost evenly in the car 6, the outputs of the scale apparatus 13A and the scale apparatus 13B are equal, therefore, the feedback amount to the position control parts 16A and 16B is 0, and There is no difference from the case of Example 1 shown in FIG. However, for some reason, suppose that the user is located in one corner of the car 6 and the output of the weighing apparatus 13A is larger than the output of the weighing apparatus 13B, for example. In this case, the rope 3A carries a weight larger than half the average weight of the car 6 including the user, and the rope 3B carries a weight smaller than the same average weight.

As a result, without correcting any control system, the driving force of the hoisting machine 1A and the hoisting machine 1B is equal, so that the acceleration of the hoisting machine 1A becomes smaller than the acceleration of the hoisting machine 1B as the weight and the load increase. As a result, a speed difference occurs, causing vibration. Also, the inclined attitude of the car 6 is not improved.

Therefore, in the seventh embodiment, as shown in FIG. 13, in the case of the above example, the output deviation between the balance device 13A and the balance device 13B becomes a positive value and is composed of the half average value. The position command correction signal is added to the input of the position control unit 16A, respectively, and added to the input of the position control unit 16B as a negative signal, that is, subtracted.

Therefore, in the control system of the hoisting machine 1A, since the input position command advances by the correction amount, the control shifts in the direction of increasing the current, and thus the torque, in order to increase the speed. On the other hand, in the control system of the hoisting machine 1B, since the input position command is delayed by the correction amount, the control shifts in the direction of decreasing the current and thus the torque in order to lower the speed. As a result, the acceleration becomes uniform, the vibration is suppressed, and the car 6 is driven to be controlled in the direction of reducing the inclination due to the user's ubiquitous, and the car 6 can be maintained in the horizontal attitude.

(Example 8)

Fig. 14 is a circuit diagram illustrating the elevator control device in accordance with the eighth embodiment of the present invention. Here, as shown in FIG. 14, the torque divider 14 which distributes the torque command (current command) output from the speed control part 17A and the speed control part 17B by appropriate distribution is provided. The torque divider 14 has a low pass filter having a desired time constant characteristic, and inputs the current command output of the speed control unit 17A and the current command output of the speed control unit 17B, and converts the difference into the low pass filter. The current command correction signal obtained by inputting to g is outputted. And the output of this torque divider 14 is added to the input terminal of each current control part 5A, 5B.

For example, when either the rope 3A or the rope 3B is difficult to start moving at the start of rotation, a difference is generated between the torque command (current command) to the current control unit 5A and the current control unit 5B accordingly. However, when the side that was difficult to move suddenly starts to move or starts to slide, the difference between the torque commands does not immediately decrease, so that a state with relatively high torque on one side continues, resulting in vibration. It is done. In order to prevent such a sudden difference from occurring in the torque command, the change is smoothed by the low pass filter of the torque distributor 14 to suppress the vibration.

(Example 9)

Fig. 15 is a circuit diagram showing the elevator control device in accordance with the ninth embodiment of the present invention. In FIG. 13 of the seventh embodiment, the position command correction signal due to the output deviation between the balance device 13A and the balance device 13B is positioned with the position control unit 16A for the purpose of maintaining the attitude of the car 6. In the ninth embodiment, the output deviation is used as a current command correction signal, and the current command correction signal from the torque divider 14 described in FIG. 14 of the eighth embodiment described above is added to the input terminal of the control unit 16B. In addition, it is set as the structure added to the input terminal of the current control part 5A and the current control part 5B.

As a result, both functions are exhibited, that is, harmful vibrations can be suppressed and the car 6 can be held in a horizontal position.

(Example 10)

Fig. 16 is a circuit diagram illustrating the elevator control device in accordance with the tenth embodiment of the present invention. Here, instead of the scale devices 13A and 13B described in FIG. 15 of the ninth embodiment, the detection of the horizontal sensor 15 that is similarly attached to the car 6 and detects the horizontal degree of the car 6. A current command correction signal is generated from the output. Therefore, like the nine cases of the same type, harmful vibration can be suppressed and the car 6 can be held in a horizontal position.

As described above, in the present invention, the current supply means provided for each of the plurality of hoisters includes a position control unit for generating a speed command of the hoist based on a deviation input between the common position command and the output feedback signal of the position detector of the hoist. And a speed controller for generating a current command of the hoist based on a deviation input between the speed command generated by the position controller and the output differential feedback signal of the position detector of the hoist, and based on the current command generated by the speed controller. Since the current control unit for outputting current is provided to the hoist, a plurality of hoists can be driven in precise synchronization and stable driving characteristics can be obtained.

Moreover, the position output transducer which averages the output of the position detector of a plurality of hoisting machines is provided, and it was made to input the position signal averaged by the position output transducer to the position control part of each hoisting machine instead of the output feedback signal of the position detector of the said hoisting machine. Therefore, even if a large difference occurs in the position output of each hoist, unnecessary vibration is suppressed.

The apparatus further includes a position output differential value converter for averaging the output differential values of the position detectors of the plurality of hoisting machines, and averaging by the position output differential value converter in place of the output differential feedback signal of the position detector of the hoisting machine in the speed control unit of each hoisting machine. Since one position differential value signal is input, unnecessary vibration is suppressed even when a large difference occurs in the position output of each hoist.

In addition, since the position detector detects the position based on the rotation angle of the rotor of the hoisting machine, a position detection output with good responsiveness can be obtained.

The position detector is a first position detector that detects a position based on the rotational angle of the rotor of the hoisting machine, and is a second position that detects the position based on the rotational angle of the driving sheave which rotates in accordance with the running of the rope for each hoisting machine. A detector is provided, and the position detection of the 1st position detector which may arise due to the acceleration / deceleration operation of a hoist by adding the deviation of a 1st position detector and a 2nd position detector to the deviation input of the position control part of each hoisting machine is provided. Since the error is compensated for, even if there is a difference in the amount of elongation on the rope and the amount of slip on the driving sheave, the car can be stably run and inclined.

The position detector is a first position detector that detects a position based on the rotation angle of the rotor of the hoisting machine, and is based on the rotation angle of the governor that rotates in accordance with the running of the rope connected to the car and the weight without applying tension. The third position detector which detects a position and adds the deviation of a 1st position detector and a 3rd position detector to the deviation input of the position control part of each hoisting machine, and is the thing which can arise due to the acceleration / deceleration operation | movement of a hoisting machine Since the position detection error of the one-position detector is compensated for, even if there is a difference in the amount of elongation on the rope or the amount of slip on the drive sheave, the running stability of the car and the posture without inclination can be obtained.

The position detector is a first position detector that detects a position based on the rotational angle of the rotor of the hoisting machine, and is a second position that detects the position based on the rotational angle of the drive sheave which rotates in accordance with the running of the rope for each hoisting machine. And a detector, wherein the deviation between the first position detector and the output differential and the output derivative of the second position detector is added to the deviation input of the speed control section of each hoist, thereby generating the acceleration and deceleration operation of the hoist. Since the position detection error of the one-position detector is compensated for, even if there is a difference in the amount of elongation on the rope or the amount of slip on the drive sheave, the running stability of the car and the posture without inclination can be obtained.

The position detector is a first position detector that detects a position based on the rotation angle of the rotor of the hoisting machine, and is based on the rotation angle of the governor that rotates in accordance with the running of the rope connected to the car and the weight without applying tension. It is provided with the 3rd position detector which detects a position, and adds the deviation of the output derivative of a 1st position detector, and the output derivative of a 3rd position detector to the deviation input of the speed control part of each hoisting machine, Since the position detection error of the first position detector, which may be caused, is compensated for, even if there is a difference in the amount of elongation in the rope or the amount of slip in the driving sheave, the car's running stability and the attitude without inclination can be obtained.

In addition, since the number of ropes is provided by the same number as the number of the hoisting machines, and each hoisting machine drives each rope, the running drive adjustment between each rope is surely performed.

In addition, since each hoist drives one or more ropes in common and drives this common part, the drive adjustment between each hoist is possible.

Furthermore, the scale apparatus which detects the weight applied to the said rope by the car side end part of each rope is provided, and each scale apparatus so that the output positions of each hoist may be mutually equal, regardless of the difference of the detection output of each scale apparatus. Since the position command correction signal based on the detection output of is added to the deviation input of the position control unit of each hoist, the acceleration of each hoist becomes uniform, the vibration is suppressed, and the car reduces the inclination due to the user's ubiquity. Can be driven and controlled, and the car can be held in a horizontal position.

Furthermore, the scale apparatus which detects the weight applied to the said rope by the car side end part of each rope is provided, and each scale apparatus so that the output positions of each hoist may be mutually equal, regardless of the difference of the detection output of each scale apparatus. Since the current command correction signal based on the detection output of is added to the input of the current control unit of each hoist, the acceleration of each hoist becomes uniform, the vibration is suppressed, and the car is in the direction of reducing the inclination due to the user's ubiquity. The drive is controlled so that the car can be held in a horizontal position.

Moreover, since it is equipped with the horizontal sensor which detects the horizontality of a car, and added the electric current command correction signal based on the output of a horizontal sensor to the input of the current control part of each hoisting machine so that a car may maintain a horizontal attitude | position, The acceleration is uniform, the vibration is suppressed, and the car is driven to be controlled in a direction of reducing the inclination due to the user's ubiquitous, so that the car can be held in a horizontal attitude.

Furthermore, when the value of the current command generated by the speed control unit of each hoist differs in each hoist period, a low pass filter having a desired time constant characteristic is attenuated so that the difference attenuates to a desired time constant, and the speed of each hoist A torque divider for inputting a current command generated by the control unit to generate a current command correction signal is provided, and the current command correction signal is added to the input of the current control unit of each hoist. Harmful vibration is suppressed.

With the above configuration, it is possible to reliably synchronize the plurality of hoisting machines, to correct the position, the speed error and the vibration caused by the difference of the elongation of the rope and the like, and to perform stable driving.

The motor constituting the hoist is not limited to the synchronous motor driven by the three-phase alternating current from the PWM inverter section described above, but the present invention is widely used in an elevator control device composed of a plurality of hoists using various types of motors. It is applicable and shows the same effect.

1 is a structural diagram showing an elevator system to which the present invention can be applied;

Figure 2 is an elevator system to which the present invention can be applied, a structural diagram showing a different way from that of FIG.

Fig. 3 is a circuit diagram showing the elevator control device in accordance with the first embodiment of the present invention;

4 is a circuit diagram illustrating an elevator control device in accordance with a second exemplary embodiment of the present invention;

FIG. 5 is a circuit diagram illustrating an example in which the configuration of FIG. 4 is further embodied. FIG.

6 is a circuit diagram illustrating an elevator control device in accordance with a third exemplary embodiment of the present invention;

FIG. 7 is a circuit diagram illustrating an example in which the configuration of FIG. 6 is further embodied. FIG.

8 is a circuit diagram illustrating an elevator control device in accordance with a fourth embodiment of the present invention;

9 is a structural diagram showing an elevator system to which the elevator control device in Embodiment 5 of the present invention is applied;

10 is a circuit diagram illustrating an elevator control device in accordance with a fifth exemplary embodiment of the present invention;

11 is a circuit diagram illustrating an elevator control device in accordance with a sixth embodiment of the present invention;

12 is a circuit configuration diagram showing an elevator control device different from that in FIG. 11 according to a sixth embodiment of the present invention;

Fig. 13 is a circuit diagram showing the elevator control device in accordance with the seventh embodiment of the present invention;

14 is a circuit diagram illustrating an elevator control device in accordance with a eighth embodiment of the present invention;

Fig. 15 is a circuit diagram showing the elevator control device in accordance with the ninth embodiment of the present invention;

Fig. 16 is a circuit diagram illustrating the elevator control device in accordance with the tenth embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

1A, 1B: hoist 2A, 2B: position detector

3A, 3B, 3C: Rope 4: Control Unit

5A, 5B: current controller 6: car

7: weight 8A, 8B: overhead sheave

9A, 9B: deflector sheave 10: position output transducer

11: position output differential value converter 12: governor

13A, 13B: Balance Unit 14: Torque Splitter

15: horizontal sensor 16A, 16B: position control

17A, 17B: Speed Control

Claims (3)

In an elevator control device for lifting and lowering the car by driving a rope connecting the cargo car and the balance weight with a plurality of hoisting machines, Supplying a current to the hoist based on a position detector for detecting the output position of the hoist for each hoist and a deviation input between a position command common to the plurality of hoists and an output feedback signal of the position detector of the hoist; With current supply means Elevator control device characterized in that. The method of claim 1, The rope is provided with the same number as the number of the said hoisting machine, and each said hoisting machine drives each said rope, The elevator control apparatus characterized by the above-mentioned. The method of claim 1, Each said hoisting machine drives one said common part in common with one or several said ropes, The elevator control apparatus characterized by the above-mentioned.